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The biogenesis of 2R,3R-(2,3-cis)-proanthocyanidins from 2R,3R-(2,3-trans)-dihydroflavonols can be accounted for by tautomerism between quinone methide and flav-3-en-3-ol intermediates.
R. W. Hemingway and P. E. Laks, J. Chem. Soc., Chem. Commun., 1985, 746 DOI: 10.1039/C39850000746
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